Combined seaming and pinking machine



. March 19, 1940. c, MQULTQN 2,194,148

COMBINED SEAMING AND PINKING MACHINE Filed June 26, i957 2 SheetsSheet 1March 19, 1940.

H. C. MOULTON COMBINED SEAMING AND PINKING MACHINE Filed June 26, 1937 lI \u 2 Sheets-Shet 2 Patented Mar. 19, 1940 commmn smmmc AND rmxmcHarley 0. Moulton, Maplewood, Mo., assignor to Lewis Invisible StitchMachine Company, St.' Louis, 110., a corporation of Maine ApplicationJune 28,

8 Claims.

This invention relates to new and useful improvements in combinedseaming and pinking machines.

In some operations, it is desirable to locate the pinked edge as closeto the line of scam as is possible, whereas in other operations thisspacing may be increased within limits.

In machines as heretofore constructed, such as is shown in the patentsto Popper 1,878,293, September 20, 1932 and 1,886,422, November 8, 1932,and in my prior applicationflled November 4, 1936, Serial No. 109,175,the stationary ledger blade is provided with a V-shaped opening toreceive the vertically reciprocatory V-shaped knife which is maintainedin yielding contactwith the edges of the ledger blade opening duringeach cutting stroke. The points of cutting move progressively towardsthe apex of the ledger blade opening and terminate when the two apicesco- I0 incide. The knife which is slightly inclined to the vertical, ispivoted at its upper end to an oscil-. latory power driven knife arm,and spring means are provided for urging the knife towards the apex ofthe ledger blade opening. The apex of the ledger blade opening is spaceda short distance from the left edge of the blade in order to locate thepinked edge close to the needle. The pinking attachment which is mountedon the base plate of the machine for adjustments towards and from theneedle, includes a base to which the ledger blade is attached. Thisledger blade projects beyond the end of the attachment base and islocated in. an opening in the base plate of the machine. Consequentlythe downblade. By reason of the fact that the ledger blade is supportedat its right hand end only, said 'blade will tend to flex downwardlyduring the cutting stroke of the knife, and occasionally 0 when seamsare fed across the blade the pressure of the knife results in thebreaking of the blade at the weakest point thereof, viz., the apex.

It will be furthermore observed that in said Popper patents, the throatplate is provided with is a bar between the right hand feed dogaccommodating opening and the ledger blade for supporting the fabricbeing pinked, and consequently the ledger blade cannot be adjustedcloser to the needle than the width of said bar will permit. to This isobjectionable because in some operations, it is desired to locate theline of pinks closer to the line of seam.

One of the objects of this invention is to provide means for supportingthe ledger blade in a 58 manner which will prevent not only the flexingward thrust of the knife is resisted by the ledger 1937, Serial No.150,621

thereof during the cutting stroke of the knife, but also the occasionalbreaking of the blade at the apex of the opening thereof.

Another object of the invention is to provide means for oiling thecontacting cutting surfaces. of the knife and blade and thereby reducethe friction therebetween during the cutting stroke of the knife.

Another object of the invention is to eliminate the right hand bar ofthe throat plate whereby the left band edge of the ledger blade may bepositioned in its place to thereby support the fabric and also locatethe points of the pinks as close as possible to the line of seam.

With these and other objects in view which will more fully appear, thenature of the invention will be more clearly understood by following thedescription, the appended claims, and the several views illustrated inthe accompanying drawings.

In the drawings:

Figure 1 is a front elevation of a combined seaming and pinking machineembodying my invention,

Figure 2 is a horizontal section taken on the line 2--2 of Figure 1,

Figure 3 is a detail cross section taken on the line 33 of Figure 2, and

Figure 4 is a perspective view showing in separated relation the throatplate and the ledger blade.

ing parts throughout the several drawings.

Referring to the drawings, the sewing machine comprises a frame A whichincludes a base plate 5, a standard 6, and an overhanging arm I whichterminates in a needle head 8. A vertically reciprocatcry needle 9 ismounted in the head 8 and is operatively connected in the usual mannerto the main shaft III which is joumaled in the overhanging arm 1 wherebythe needle will be reciprocated once for each rotation of said shaft.

The needle cooperates with a loop taker (not shown) located below thebed plate to form a line of stitches in the usual manner.

The base plate 5, directly below the needle, is provided with an openingII which extends longitudinally of the overhanging arm I and includesspaced front and rear longitudinally extending walls l2, Hi, the upperface of the base 5 along said walls being recessed to formlongitudinally extending seats I, I 5 for receiving a throat plate Bwhereby the upper surface of said throat plate will lie substantiallyflush with the figures of the 2 arcane upper surface of the base plateI, the throat plate being rigidly attached to the bedplate by screws II,It.

The throat plate B is substantially U-shaped construction and includesspaced arms l1, II which extend longitudinally of the opening II, and anintegral connecting bar It at the left end thereof. Abar it isalsointesral with said arms and is disposed in parallelism with the barI. to form a resultant feed dog accommodating slot 2. therebetween. Thearms l1, l1 thus project in a general plane at right angles to the slot20. The bar O is provided centrally with an integral oii'set 2| whichprojects into the space between the arms l1, l1, and is provided with aneedle opening 22. Brent and rear flanges 23, 22 which are integral withthe inner edges of the arms H, H project inwardly towards each other,and their upper surfaces 24, 24 are disposed below the upper surfaces ofthe arms H, H to form supporting seats for the ledger blade C, the leftends of the flanges being spaced from the bar it to form resultant frontand rear feed dog accommodating slots 2!, 28 which are respectivelylocated in front and rear of the offset 2| containing the needle opening22 and in open communication with the space between the arms l1, II. Avertically yieldable presser foot D is mounted on the head 8 in theusual manner for cooperation with the throat plate B to clamp thefabrics therebetween while the needle is in the fabrics and while thefabrics are being pinked by the vertically reciprocatory V- shaped knifeE.

A i-motion feed dog F which is supported below the base plate I forcooperation with the presser foot, includes a feed section 21 whichoperates in the slot 20 of the throat plate 13 and alined front and rearfeed sections 28, 29 which operate in the slots 25, 26 of said throatplate.

The ledger blade C is provided with spaced arms 30, 20 which areattached to a pinking attachment base G, and with a V-shaped openingforming converging cutting edges 3|, 3| and an apex 22. The cuttingedges converge towards the needle, the apex is located centrally betweenthe arms l1, II of the throat plate and in alinement with the needle,and the apex is spaced a short distance from the left edge of the blade.The attachment base G is mounted on the bed plate 5 for longitudinaladjustments towards or from the needle by means of a slot 33 formed insaid base G and a clamping screw 24 which threadably engages an openingin the base plate 5. Thus, the ledger blade 0 can be readily shiftedtowards or from the needle to vary the distance between the line of seamand the line of pinks. The left hand edge of the ledger blade C can bepositioned directly against the offset 2| of the throat plate, andconsequently the apex 32 of the ledger blade opening will be positionedas close as possible to the needle to thereby permit of the narrowestspacing possible between the line of seam and the line of pinks. It willbe observed that the flanges 23. 23 of the throat plate constitute afirm support for the ledger blade in any position of longitudinaladjustment thereof.

The knife E includes converging cutting walls ll, ll and is pivotallyconnected as at 28 to the free end of a knife lever 2'! which isfulcrumed on the attachment base G as at ll. A yieldable means 20, whichis disclosed in my prior application referred to above, is interposedbetween the knife lever 21 and the knife and functions The blade isprovided on opposite sides of the cutting edges 8|, 3| with integral andupstanding guide lugs 42, 42 which function not only to maintain theknife in proper registration with the ledger blade opening, but also toprevent the knife escaping said registration should the lower end of theknife during its upstroke be moved above the upper surface of the blade.These lugs are each provided with a downwardly inclined bore 42extending from the upper outer corner of the lug to the lower inner facethereof, and an oil wick 44 is positioned in said bore for carrying oilor other lubricant to the cutting surfaces of the knife and blade.

The right hand side portion of the foot D overhangs the offset 2| andthe left end of the ledger blade and thereby cooperates with the latterto clamp the edges of the fabrics against the blade between theintermittent feed strokes of the feed dog.

It is of course to be understood that the details of structure andarrangement of parts may be variously changed and modified withoutdeparting from the spirit and scope of my invention.

I claim:

1. A throat plate for sewing machines, comprising spaced arms and spacedbars connecting said arms and forming a feed dog accommodating slottherebetween, one of said bars having a centrally located integraloffset projecting into the space between the arms and provided with aneedle opening, said offset forming resultant feed dog accommodatingslots located in front of and in rear of said offset and having opencommunication with the space between the arms of the plate, the armsbeing provided beyond the offset with depressed flanges extendinginwardly towards each other for forming seats for a ledger blade.

2. In a combined seaming and pinking machine, the combination with avertically reciprocatory needle, a base plate having an opening, athroat plate secured to the base plate and extending across the openingthereof, said throat plate comprising spaced arms and spaced barsconnecting said arms and forming a feed dog accommodating slottherebetween, one of said bars having a centrally located integraloffset provided with a needle opening and forming resultant feed dogaccommodating slots located in front of and in rear of said offset andhaving open communication with the space between the arms of the throatplate, and a pinking attachment mounted on the base plate on the side ofthe base plate opening opposite the needle, said attachment including aledger blade and a cooperating cutting element, the ledger blade beingpositioned in the base plate opening between the arms of the throatplate and against the oil.- set thereof.

3. In a combined seaming and inking machine, the combination with avertically reciprocatory needle, a base plate having an opening, athroat plate secured to the base plate and extending across the openingthereof, said throat plate including spaced bars forming a feed dogaccommodating slot, one of the bars having a centrally located oifsetprojecting into the base plate opening and provided with a needleopening and forming resultant feed dog accommodating slots located infront of and in rear of said offset and having open communication withsaid base plate opening, a presser foot cooperating with the throatplate and having a side portion overhanging the offset and the baseplate opening, and a pinking attachment mounted on the base plate on theside of the base-plate opening opposite the needle, said attachmentincluding a ledger blade and a cooperating cutting element, the ledgerblade being positioned in the base plate opening and having one endpositioned under the overhanging side portion of the presser foot andagainst said offset.

4. In a combined seaming and pinking machine, the combination with avertically reciprocatory needle, 2. base plate having an opening, athroat plate secured to the base plate and extending across the openingthereof, said throat plate including spaced bars forming a feed dogaccommodating slot, one of the bars having a centrally located offsetprojecting into the base plate opening and provided with a needleopening and forming resultant feed dog accommodating slots located infront of and in rear of said offset and having open communication withsaid base plate opening, a presser foot cooperat ing with the throatplate and having a side portion overhanging the offset and the baseplate opening, a pinking attachment mounted on the base plate on theside of the base plate opening opposite the needle, said attachmentincluding a ledger blade and a cooperating cutting element, the ledgerblade being positioned in the base plate opening and having one endpositioned under the overhanging side portion of the presser foot andagainst said ofiset, and means secured to the throat plate forsupporting said ledger blade against the thrust of the knife.

5. A combined seaming and pinking machine including a reciprocableneedle, and a pinking mechanism disposed at one side of the needle theopening therein for maintaining the cooperative relation of said knifeand blade, and means supported by said lugs for directing a lubricant tothe cutting walls of the knife.

6. A combined seaming and pinking machine including a reciprocableneedle, and a pinking mechanism disposed at one side of the needle andincluding a horizontally disposed ledger blade having an opening formingconverging cut ting edges, and a knife movable upwardly and downwardlywith respect to the ledger blade and having converging cutting walls,guide lugs projecting from the ledger blade at opposite sides of theopening therein for maintaining the cooperative relation of said knifeand blade, and means supported by said lugs for directing a lubricant tothe cutting walls of the knife, said means comprising a bore formed ineach lug and communicating with the inner face thereof, and alubricant-carrying wick in said bore.

'7. In a combined seaming and pinking machine, a base plate having anopening, a throat plate supported by the base plate and extending acrosssaid opening and provided with a needle opening and a feed dogaccommodating slotway, and a horizontal ledger blade supported by saidthroat plate and partially defining said slotway.

8. In a combined seaming and pinking machine, a base plate having anopening, a throat plate supported by the base plate and extending acrosssaid opening and provided with a needle opening and a feed dogaccommodating slotway, said throat plate being provided with spacedlaterally extending arms disposed along the front and rear edges of thebase plate opening, a ledger blade supported on said arms, and meanspositioning said ledger blade on said arms so that a portion thereofpartially defines said slotway.

HARLEY C. MOULTON.

